1. What is Inverter Battery Backup Time?

The inverter battery backup time is the duration for which your inverter can power connected devices using the stored energy in the battery. It depends on the battery capacity (Ah), voltage (V), and the power consumption (W) of connected devices.

2. How Does the Calculator Work?

The calculator uses the backup time formula:

Where:

• \( Ah \) — Battery capacity in amp-hours
• \( V \) — Battery voltage in volts
• \( W \) — Total power consumption of connected devices in watts

Explanation: The formula calculates how long a battery can sustain a given load by dividing the total energy stored in the battery (Ah × V) by the power consumption rate (W).

3. Importance of Backup Time Calculation

Details: Knowing your inverter's backup time helps in power management during outages, proper sizing of battery banks, and ensuring critical devices remain powered for required durations.

4. Using the Calculator

Tips: Enter battery capacity in Ah, battery voltage in V (typically 12V, 24V, or 48V), and total load in watts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: This provides theoretical maximum. Actual backup time may be 10-30% less due to conversion losses, battery age, and temperature effects.

Q2: What's typical backup time for home inverters?
A: For a 150Ah 12V battery powering 300W load: ~6 hours. For 500W load: ~3.6 hours.

Q3: How can I increase backup time?
A: Use higher capacity batteries, reduce connected load, or add more batteries in parallel.

Q4: Does battery type affect backup time?
A: Yes. Lithium batteries provide more usable capacity than lead-acid at similar Ah ratings.

Q5: Should I consider inverter efficiency?
A: For more accurate results, divide result by inverter efficiency (typically 0.85-0.95 for good inverters).